I bought one of those mini USB Hoover Senior-style vacs a few years ago, and frankly, out of the box it was poo, so, again I modified it, and it worked better, cos I modified it so it was a dirty-fan vac (as per the original thing) with a cloth bag on the back, but unfortunately it got put in a box, and then some heavy 12v 7ah lead acid batteries were added to the same box, and it got crushed... :\